I think this is good advice -- you have great experience working with one (pretty great) environment for building styles, and broadening that is important. I know you've been working with Drupal as well -- make sure you understand both versions 6 and 7, 6 is still pretty big in deployment. Wordpress theming is a huge area of work as well -- people will pay for themes custom built for their sites, but they do want to see what you've done, so getting out some of those in your portfolio will be very helpful. The hot things in this arena are all the buzzwords: responsive design, fluid design, user experience, and so on. So many people think in buzzwords, of course, but truly understanding what they mean is so much more. I don't recall if you've got javascript in your utility belt, but you can start to learn about that, especially libraries like jQuery and its community. You already mentioned hooking with some communities, see if there are UX communities as well. Hanging out in DW is pretty different from the "rest of the world" where people don't ever spend more than a minute thinking about design, so I guess be prepared for that.